Mga kasunduang itinakda sa paghahati ng paggalugad sa daigdig sa pagitan ng spain at portugal​

i dont really undunderstand Explanation:

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

four sitting presidents have been assassinated while in office but the first was abraham lincoln,